APA (7th ed.) Citation

Coward, H. F., & Jones, G. W. (1926). Extinction of methane flames by helium. [publisher not identified].

Chicago Style (17th ed.) Citation

Coward, H. F., and G. W. Jones. Extinction of Methane Flames by Helium. Washington, D.C.: [publisher not identified], 1926.

MLA (9th ed.) Citation

Coward, H. F., and G. W. Jones. Extinction of Methane Flames by Helium. [publisher not identified], 1926.